/* 现代化首页样式 - 完全重新设计 */

/* 返回顶部按钮统一样式 */
.back-to-top-btn {
    position: fixed !important;
    bottom: 20px !important;
    right: 20px !important;
    width: 24px !important;
    height: 24px !important;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    color: white !important;
    border: none !important;
    border-radius: 50% !important;
    cursor: pointer !important;
    z-index: 999999 !important;
    font-size: 12px !important;
    font-weight: bold !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    opacity: 0 !important;
    transform: translateY(0px) scale(1) !important;
    transition: all 0.3s ease !important;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3) !important;
    pointer-events: all !important;
    backdrop-filter: blur(10px) !important;
}

.back-to-top-btn:hover {
    transform: translateY(-2px) scale(1.1) !important;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4) !important;
    background: linear-gradient(135deg, #5a67d8 0%, #667eea 100%) !important;
}

.back-to-top-btn:active {
    transform: translateY(0px) scale(0.95) !important;
}

.back-to-top-btn i {
    font-size: 12px !important;
    margin: 0 !important;
    padding: 0 !important;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #ff6b6b;
    --success-color: #4ecdc4;
    --warning-color: #ffd93d;
    --info-color: #6bcf7f;
    
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: #a0aec0;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

/* 现代化背景 */
html {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    touch-action: manipulation;
    overflow-x: hidden;
    background-color: transparent !important;
    background: transparent !important;
    background-image: none !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    /* 不设置背景，让 JavaScript 控制背景 */
    background-color: transparent !important;
    background: transparent !important;
    background-image: none !important;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    -webkit-tap-highlight-color: transparent;
    line-height: 1.6;
    position: relative;
}

/* 移除了gradientShift动画，因为不再使用渐变背景 */



/* 主内容区域 */
.main-content {
    padding: var(--spacing-lg) var(--spacing-md);
    padding-bottom: 80px; /* 减少底部填充，避免多余高度 */
    max-width: 430px;
    margin: 0 auto;
    min-height: calc(100vh - 80px); /* 调整最小高度 */
    background: transparent !important;
    background-color: transparent !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
    box-sizing: border-box;
    border-radius: 0;
    position: relative;
    z-index: 1;
}

@media (min-width: 430px) {
    .main-content {
        border-radius: var(--radius-2xl);
        margin-top: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
}

/* 顶部海报区域 - 全新设计 */
.poster-container {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.poster-placeholder {
    height: 180px;
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.poster-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.poster-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 100%);
}

.poster-content {
    text-align: center;
    color: white;
    z-index: 3;
    position: relative;
}

.poster-content i {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.poster-content p {
    font-size: 1.125rem;
    font-weight: 600;
    opacity: 0.95;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 0.5px;
}

/* 新的海报横幅样式 - 统一高度 */
.poster-banner {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
    height: auto; /* 自适应高度，确保图片完整显示 */
    background: linear-gradient(135deg, #f7f9fc 0%, #eef2f7 100%);
}

/* 让图片完整显示且自适应容器宽度 */
.poster-image {
    width: 100%;
    height: auto !important;
    display: block;
    object-fit: contain; /* 保险：不同端仍保持不裁切 */
    object-position: center;
    background: transparent;
}

/* 移除悬停放大，避免出现被裁切/溢出导致底部空白 */
.poster-banner:hover .poster-image {
    transform: none;
}


/* 功能区域 - 全新卡片设计 */
.features-container {
    margin-top: var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.feature-item {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-lg) + 4px);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    min-height: 130px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.5);
}

.feature-item:hover::before {
    opacity: 1;
}

.feature-item:active {
    transform: translateY(-2px) scale(1.01);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2f7 100%);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

/* 让emoji在图标内视觉居中且清晰 */
.feature-icon .emoji {
    font-size: 22px;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,.12));
}

/* 抖抖功能的图标背景使用更活泼的浅色渐变 */
.features-container#douyinFeatures .feature-item[data-feature="hotSearch"] .feature-icon {
    background: linear-gradient(135deg, #fff1e6 0%, #ffe0cc 100%);
}

.features-container#douyinFeatures .feature-item[data-feature="benchmarkVideo"] .feature-icon {
    background: linear-gradient(135deg, #eaf4ff 0%, #e4ecff 100%);
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0) 100%);
}

/* 特定功能的颜色主题 */
.feature-item[data-feature="benchmark"] .feature-icon {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.feature-item[data-feature="product"] .feature-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.feature-item[data-feature="viral"] .feature-icon {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.feature-item[data-feature="refresh"] .feature-icon {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.feature-item:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.feature-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-xs);
    letter-spacing: 0.4px;
}

.feature-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.feature-item:hover .feature-glow {
    opacity: 1;
}



/* 响应式设计 */
@media (max-width: 375px) {
    .main-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .features-grid {
        gap: var(--spacing-sm);
    }
    
    .feature-item {
        padding: var(--spacing-md);
        min-height: 110px;
    }
    
    .feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }
    
    .feature-text {
        font-size: 0.95rem;
    }
    
}

/* 加载动画已移除 - 使用3D出场动画代替 */

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e2e8f0;
        --text-secondary: #a0aec0;
        --text-light: #4a5568;
        --bg-primary: #1a202c;
        --bg-secondary: #2d3748;
        --bg-tertiary: #4a5568;
    }
    
    .app-container {
        background: rgba(26, 32, 44, 0.95);
    }
    
    .feature-item {
        background: rgba(45, 55, 72, 0.8);
        border-color: rgba(255, 255, 255, 0.1);
    }

}

/* 高对比度和可访问性 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式 */
@media print {
    .app-container {
        box-shadow: none;
        background: white;
    }
}